title: Palladium-catalyzed sp2 and sp3 C-H bond activation and addition to isatin toward 3-hydroxy-2-oxindoles.
abstract: The first Pd(II)-catalyzed C-H addition to isatins by direct sp(2)/sp(3) C-H bond activation for the construction of 3-substituted-3-hydroxy-2-oxindoles is reported. The bidentate nitrogen ligands were found to promote this reaction. Specifically, the preliminary bioassay indicated that 3-(5-chlorobenzoxazole)-3-hydroxy-N-benzyl-2-oxindole (2w) is a new inhibitor of human kidney cancer and hepatocellular carcinoma cells. Moreover, this reaction system exhibits great functional group tolerance and requires no directing group, extra base, or additives.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, P. R. China, and State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics , Lanzhou 730000, P. R. China.
authors.forename: Gang-Wei
authors.initials: GW
authors.lastname: Wang
authors.forename: An-Xi
authors.initials: AX
authors.lastname: Zhou
authors.forename: Jun-Jiao
authors.initials: JJ
authors.lastname: Wang
authors.forename: Rong-Bin
authors.initials: RB
authors.lastname: Hu
authors.forename: Shang-Dong
authors.initials: SD
authors.lastname: Yang